Viện cơ mật
The Viện cơ mật or "Secret Institute" was the Privy Council and key mandarin agency of the royal court of Vietnam's final Nguyễn Dynasty at Huế, until the end of the dynasty in 1945.
Minh Mạng established the Viện cơ mật along with the Nội Các Viên as the main agencies of the court's administration. The Privy Council, or Secret Institute, comprised four of the most senior mandarins.
